Anyone running Redline MT90 or MTL in your manual transmission. How is shifting?
NP435. Granted, meant to be shifted deliberately, not like a race car. Had unknown fluid, suspected to by syn though, that shifted ok if slow to down-shift. Changed to MT-90. Little smoother upshifts, certainly better down-shifts, and the old drive train roar is QUIETER by a surprising margin. I don't know what accounts for that. (Yes, the old fluid was topped up adequately.)
Prior experience was with the chitty borg-warner trans design saab used in the 99/900. MTL in those improved shifting; it was still a long throw even with a short kit, but it was more cooperative anyway. Whether MTL contributed pro/con to that transmission's already questionable longevity remains a mystery.
I recently replaced the fluid in my 6 speed Tacoma with Amsoil 75W-90. It was immediately smoother shifting.
Mobil One 75 W 90 in my 4Runner....
Pretty much all I've ever ran... so I don't know if other regular 80W90 would shift less efficiently...
Change it every 100,000 miles...
same stuff used in the rear end, front diff, and transfer case...
close to 540,000 on the transmission
Can't use diff oil in it, has brass syncros and the sulfer in diff oil corrodes them. Have been using rotella strait 30 that is also speced for transmission use also cause the factory part number for fluid is 10w30 motor oil. Owners manual is a misprint, it says 75 90. About due for a change and thought I would try redline since it's esters based (true) sytheteic.
Can't use diff oil in it, has brass syncros and the sulfer in diff oil corrodes them. Have been using rotella strait 30 that is also speced for transmission use also cause the factory part number for fluid is 10w30 motor oil. Owners manual is a misprint, it says 75 90. About due for a change and thought I would try redline since it's esters based (true) sytheteic.
We use Redline MTL in the German cars and it really improves shifting, especially when cold and reduces noise. Some of the BMW V8 6 speeds are notorious for balky shifts and Redline straightens that out.
I'm a believer in their products. They make great diff oil for heavy applications too. I use their Shockproof 75W250 in my Cummins diffs and have not had any issues. Reduced gear noise in my current truck noticeably.
Thanks badger, that's what I was looking for. I was also gonna do the rear diff in my jeep cause I changed it a couple of years ago and put 75w90 royal purple in it and read after I changed it that if you tow with it to use 75w140. I pull a boat with it so I may try their diff lube also, if I can find it. I may just end up filling it with shell spirax.
Thanks
T-roy
I just changed the fluid in my 92 Wrangler using Redline MT-90 about 2 weeks ago. Reviews by others and the company's claims made me go with the Redline; I have only had the Jeep for a few months and don't know what was in there previously. I really haven't noticed much difference; the transmission shifting is still a little notchy but it seems a bit less noisy now.
I just changed the fluid in my 92 Wrangler using Redline MT-90 about 2 weeks ago. Reviews by others and the company's claims made me go with the Redline; I have only had the Jeep for a few months and don't know what was in there previously. I really haven't noticed much difference; the transmission shifting is still a little notchy but it seems a bit less noisy now.
It's a bit thick. The factory part number for fluid is a 10w30 motor oil. MT90 is for transmissions that calls for 75w90, the wrangler's owners manual is a misprint. MTL is a 70w80 equivalent to 30 weight but designed especially for manual transmissions. I had 75w90 in mine and it shifted like hammered $hit. Put 30 weight in it and it's much better. But I'm still gonna go with MTL next time.
Had great luck with RL MT90 in my 99 Tacoma's 5 speed.
Just put 2 quarts of MT90 in a new project truck yesterday. It made a whining sound while driving but shifted perfectly. I shifts good as ever but the whining sound is history.
Into the second page and no one has confused a transmission with a cross-dresser. I thank you all.
It looks like a girls car but it has a stick.
BIL's dad had a ford Ranger for years. He put Redline in it from about 50k miles on. I drove it one day when it had like 300k on it and i couldn't believe how smooth and tight it shifted.
I just bought a rebuilt G52 5 speed manual trans for my 1985 Toyota 4X4 pickup and the shop guy said to use 10W-40 engine oil in it, NOT 80/90 gear oil. He said when it's cold outside and the gear oil is cold, if you push the shifter hard you can actually break the aluminum shift fork from the resistance of the thick oil.
He also said NOT to run synthetic because it's actually too slippery for the synchros to work right.
My Chilton manual recommends GL-4 or GL-5 75/90 or 80/90 gear oil.
I'm going to use the 10W-40 because the shop will warranty the trans with that oil. They wrote on the side of the trans case by the check bolt in sharpie "10W-40 motor oil."
Thanks badger, that's what I was looking for. I was also gonna do the rear diff in my jeep cause I changed it a couple of years ago and put 75w90 royal purple in it and read after I changed it that if you tow with it to use 75w140. I pull a boat with it so I may try their diff lube also, if I can find it. I may just end up filling it with shell spirax.
Thanks
T-roy
According to ECGS, never, ever use Royal Purple in your diff. All they do is gears and have a pretty good idea what works and what doesn't. They recommend Lucas oil, but Royal Purple is the only brand they say not to use. I use Lucas 85-140 in my Tacoma.
Pennzoil Synchromesh. Our Cherokee 5 speed has never been happier.
I just bought a rebuilt G52 5 speed manual trans for my 1985 Toyota 4X4 pickup and the shop guy said to use 10W-40 engine oil in it, NOT 80/90 gear oil. He said when it's cold outside and the gear oil is cold, if you push the shifter hard you can actually break the aluminum shift fork from the resistance of the thick oil.
He also said NOT to run synthetic because it's actually too slippery for the synchros to work right.
My Chilton manual recommends GL-4 or GL-5 75/90 or 80/90 gear oil.
I'm going to use the 10W-40 because the shop will warranty the trans with that oil. They wrote on the side of the trans case by the check bolt in sharpie "10W-40 motor oil."
The syncromesh and redline type fluids are designed specifically for manual transmissions even if they are synthetic, that mechanic is old school and has no knowledge of new lubricants.
Yeah, I wonder how much that shop guy really knows or understands about gear oil. Gear oil viscosity and motor oil viscosity are not comparable. 75W-90 gear oil is about the same as 10W-40 motor oil.
Here's a basic primer on the difference:
http://www.widman.biz/uploads/Transaxle_oil.pdfViscosity:
First it should be noted that the SAE motor oil viscosity chart (J300) is different from the SAE gear oil
chart (J306). A SAE 40 motor oil has approximately the same viscosity as one of the thinner SAE 90
gear oils, while the SAE 50 Motor oil is similar in viscosity to the thicker SAE 90 gear oils.
I just bought a rebuilt G52 5 speed manual trans for my 1985 Toyota 4X4 pickup and the shop guy said to use 10W-40 engine oil in it, NOT 80/90 gear oil. He said when it's cold outside and the gear oil is cold, if you push the shifter hard you can actually break the aluminum shift fork from the resistance of the thick oil.
He also said NOT to run synthetic because it's actually too slippery for the synchros to work right.
My Chilton manual recommends GL-4 or GL-5 75/90 or 80/90 gear oil.
I'm going to use the 10W-40 because the shop will warranty the trans with that oil. They wrote on the side of the trans case by the check bolt in sharpie "10W-40 motor oil."
Your guy is out to lunch on both counts. 80W90 gear oil is a hypoid oil and contains sulphur, which is detrimental to brass synchros. That's the real reason not to use it. His second theory about synthetics being too slippery is equally bizarre. We have used it for over 20 years on everything from the current models going all the way to Porsche 356's circa late 50's without any problems.
Thanks badger, that's what I was looking for. I was also gonna do the rear diff in my jeep cause I changed it a couple of years ago and put 75w90 royal purple in it and read after I changed it that if you tow with it to use 75w140. I pull a boat with it so I may try their diff lube also, if I can find it. I may just end up filling it with shell spirax.
Thanks
T-roy
According to ECGS, never, ever use Royal Purple in your diff. All they do is gears and have a pretty good idea what works and what doesn't. They recommend Lucas oil, but Royal Purple is the only brand they say not to use. I use Lucas 85-140 in my Tacoma.
Yep, have heard the same. I'm gonna drain it and refill with 75w140 before it gets cold. The data 30 in the YJ is the week link and I sure don't want to do anything to help it fail. Thanks
Weak not week, just in case the spelling correctors show up.
Well crap. My Toyota factory service manual says to use API GL-4 or GL-5 75W-90 oil.
From Red Lines website concerning their MT-90 75W90 GL-4 gear oil:
"Appropriate coefficient of friction for most manual transmission synchronizers (other's synthetic gear oils are often too slippery for proper synchro engagement)"